两个高相等,底面半径之比是1:2的圆柱与圆锥,它们的体积之比是 .
=0.75== : = %
= : =75%=3÷ = .(填小数)
10÷ = :75== %= (填小数).
÷4=2=3=.
÷ = %=0.375=.